Telephone receiver



Patented Jan.' 27, 1925.

n HENRY G. LECE, l" BBOQRLYN, NEW YORK.

TELEPHQNE REC.

Application filed November 29, 1021. Serial No. 518,495.

To all whom it may concern: .I

Be it known that I, HENRY Gr. LEACH, a

citilzen of the United States, and a resident of Brooklyn, in the county of Kings and Stateof New" York, have invented certain newand useful Improvements in Telephone Receivers, of which the following is a speci-v The invention. relates to improvements 1n i0 telephone receivers, more particularly such as are 'einployed for the reception of radio signals: and it has for its object to render receivers of this type highly sensitive.

The nature of the invention, however, will best be understood when described in connection with the accompanying drawings, 1n whichi i Fig. 1 is a. vertical section thru the 1mproved receiver.

FiV s. 2 and 3 are transverse sections thereof4 ta en on the lines 2-2 and 3 -3 respectively, and looking in the direction of .the arrows. p

Similar characters of reference designate f corresponding parte thruoutthe several views.

Referring 'to the drawinffs et, designates a suitable casing in the bottom of which ismounted a permanent magnet-11 having a pair of outwardly directed pole shoes 12, which' magnet and shoes are respectively of steel and iron and laminated, as shown. The pole pieces. 12 are surrounded by windings 13 and cooperate with a diaphragm. 14 held 3:5 to the casing by a cap 15, all of which is well understood and forms no part of the present invention. A

lu accordance .withthe invention, there is provided over the inner faces of therecopper strip 17; and the same may be brought around the under faces of the shoes to the magnet. There is provided, also, to encircle the respective windings 13 a copper with respect to the other is thereby altered through the interposition of the sheaths. 4it is well known that detrimental eiieetsre. sult from unequal distributedvcapacity in a coil through which currents resultinv in high audio lrequencien are blowing, and by thus roviding an equalizing capacity, an even istribution of potential is maintained between two coils and better reception of high (from 1000 to 2000) audio frequency 'vibrations is obtained. A particularly sen' sitive instrument is thus provided which will be responsive to extremely weak currents and adords a most satisfactory receiver, especially for such purposes as the reception of radio signals.

claimtl. na telephone receiver: a magnet having two pole shoes, and a copper sheath alongeach of the inner facesthereof.

2. n a telephone receiver: a magnet hav- .ing two pole shoes, a winding about each shoe, end a copper sheath about each of thc windings. I

Y 3. In a telephone receiver: a magnet having two pole shoes, a .copper sheath along the inner face oi" each pole shoe, and acoppersheath about each winding.

li. 1n a telephone receiver s a magnet hav-i ingtwo poleshoes, a 'copper sheath along the inner face of each pole shoe, a winding about each pole shoe, and a copper sheath v about each winding and split longitudinally. spectivo pole shoes a. copper strip A16 vand a Signed at New York. in the county of New York and State vf New" York, this 26th dayo November, A. D. 1921.

HENRY G. LEACH. 

